Beam compass for marking and cutting



' Oct. 30, 1956 N. CHIARAVALLOTI 2,768,443

BEAM COMPASS FOR MARKING AND CUTTING Filed Sept. 28, 1955 INVENTQR Ma, MIWMJ Y ORNEY BEAM COMPASS FOR MARKING AND CUTTING Nicola Chiaravallofi, East Orange, N. J.

Application September 28, 195$, Serial No. 567,190

2 Claims. (Cl. 33-27) This invention relates to a beam compass adapted to mark, and or cut, materials.

One of the objects and advantages of the invention is to provide a simple and inexpensive beam compass, especially for functioning on unusually large dimensions.

Another object and advantage is to provide a beam compass which may be used not only to mark materials, which materials may or may not be intended to be subsequently out along the marking, but also to perform the cutting operation, either without marking or after marking.

A further object and advantage is the provision of a compass, of the kind described, which is self holding or anchorable to both penetrable and impenetrable materials.

Other objects and advantages will be apparent to those using the instrument.

The drawings illustrate one form of the invention, as required:

Fig. 1 is a perspective broken view of the device.

Fig. 2 is a bottom perspective of one of the plates used in the device, and of a glass cutter adapted to be held by the plate; and

Fig. 3 is a bottom perspective of another plate used in the device and also of anchoring means carried thereby.

Referring to the drawings for a more detailed description thereof, the numeral 5 indicates a fiat beam or bar, preferably of wood or other easily penetrable material. Beam or bar 5 may be as long as desired, and for extraordinary lengths may be an unmarked, but adequately rigid stick, for economical reasons, but for shorter lengths, is preferably marked off in length units, as for the yardstick shown in Fig. 1.

According to my invention, two plates constitute part of the device, numbered 7 and 9 respectively. These plates are adapted to be quickly secured to the beam 5 at any desired distance apart, as indicated by the markings on the beam. Plate 7 is oblong and is longer than the width of the yardstick 5, and has a pair of aligned and spaced tacks i2 projecting from its lower face along 7 its major axis, so that thumb pressure on the plate is sufiicient to cause the tacks to penetrate the yardstick beam and hold the plate in place, crosswise of the beam, with the tacks on the proper marking. This plate, being longer than the width of the beam, extends beyond a side edge of the latter, thus providing an overhanging portion, and in this portion is provided with an aperture through which freely extends a pivot or centering pin 15. This pin is pointed at one end so that it may penetrate, under thumb pressure, more or less easily penetrable material as Wood, etc. The other end of the pin carries a vacuum suction cup 17, so that the pin may be held to nonpenetrable material, as glass, etc., the vacuum cup also serving as a head for the pin when the pointed end of the latter is used to penetrate, with the thumb pressing the vacuum cup.

States Patent 0 2,768,443 Patented Oct. 30, 1956 The plate 9, like plate 7, is oblong and of the same dimensions, and is placed crosswise on the beam with an overhanging portion, and has a pair of spaced and aligned tacks 18 projecting from its lower face along its major axis, these tacks being pressed into the beam by thumb, at the proper marking of the beam. This plate is also provided with an operture 21, in line with the tacks 18, to receive a marker, as a pencil 22, for example, to mark out arcs and circles. The marker may also be a small paint brush, as a striper for example. This plate also has an open notch 24 cut in one end, so that a glass cutter 25, which has a cutting wheel 26, may be held to the plate for the purpose of cutting glass in arcs or circles. The cutter 25 is of conventional design, being provided with the usual glass-breaking notches 27, so that the cutter will fit into notch 24 of the plate and be held thereto, the thickness of the plate being substantially equal to the width of a notch 27. Connecting its aperture 21 and the notch 25 of the plate is a slot 30, which is adapted to receive a razor blade, for cutting purposes.

What is claimed is:

1. A device of the character described, comprising a beam in the form of a flat wooden yardstick having scale or distance markings thereon, a first plate disposed on said beam crosswise thereof and secured thereto, and having a pair'of spaced, aligned tacks projecting from its underside and into the beam to secure said first plate to the beam, said first plate having a length greater than the width of said beam and extending beyond or overhanging a side edge thereof, said plate having an aperture through its thickness in the overhanging portion, and aligned with said tacks, centering means comprising a pin slidably passing through said aperture of said first plate and a vacuum cup attached to one end of said pin, the other end of said pin being pointed, the vacuum cup serving as a head for the pin when the pointed end of the latter is used to penetrate, a second plate on, and disposed crosswise of, said beam and secured thereto, said second plate having a pair of spaced aligned tacks extending from its lower surface and extending into said beam, the length of said second plate being longer than the width of said beam and having a portion extending beyond or overhanging a side edge of said beam, and having, in its overhanging portion, an aperture and an end notch, both aligned with said tacks in said second plate, the latter having also a vertical slot connecting said aperture and end notch and in line with the tacks of the second plate, the aperture in the second plate being adapted to receive a marker, the notch being adapted to receive a cutter, and said slot being adapted to receive a razor blade.

2. A device of the character described, comprising a beam having scale or distance markings thereon, a first plate disposed on said beam crosswise thereof, and having a pair of spaced, aligned tacks projecting from its underside and into the beam to secure it to the beam, said first plate having a length greater than the width of said beam and extending beyond or overhanging a side edge thereof, said plate having an aperture through its thickness in the overhanging portion, and aligned with said tacks, centering means comprising a pin slidably passing through said aperture of said first plate and a vacuum cup attached to one end of said pin, the other end of said pin being pointed, the vacuum cup serving as a head for the pin when the pointed end of the latter is used to penetrate, a second plate on, and disposed crosswise of, said beam, said second plate having a pair of spaced, aligned tacks extending from its lower surface and into said beam, the length of said second plate being longer than the width of said beam and hav ng a portion extending beyond, or

overhanging, a side edge of said beam, and having, in its overhanging portion, an aperture and an end notch, both aligned with said tacks in said second plate, the latter having also a vertical slot connecting said aperture and end notch and in line with the tacks of the second plate, the aperture in the second plate being adapted to receive a marker, the notch being adapted to receive a cutter, and said slot being adapted to receive a razor blade.

References Cited in the file of this patent UNITED STATES PATENTS Coxhead Mar. 7, 1911 Bohn Jan. 16, 1912 Rollins Aug. 7, 1917 FOREIGN PATENTS Great Britain 1909 

